grinder stalling

peter r

peter r

Joined
Jun 8, 2009
Messages
1,690
i have a 2 hp 1750 rpm single phate motor on my kmg clone grinder. its wired 220. if i press a piece of steel into the platen not even hard, the motor almost stops? whats up with this? how do i fix it?
 
well how is the tension on the belt... is it fairly loose or is it really tight... that could be your problem. also check to see if the belt is supposed to go a certain direction... i dont know about this stuff but thats all i could think of with what my belt sander is like (shopsmith belt sander)
 
Was it running fine before? Or is this a new build? Need to know more specifics.
Check all wheels and shaft to see if they are spinning free. Check you wiring. Are you sure it's wired correctly for 220?
 
The first thing I would check is that both legs of 110 are hot. It sounds exactly like what my 220 wired grinder was doing when it was running on 110.
 
Yup. Sounds like a 220 motor running on 110. I'll bet something isn't wired right.

*beware, wired "not right" can be really dangerous*
 
Also make sure your v belt is not greasy. I had that happen too.
 
how do i check the 110 thing. i did the wiring myself. i have a 220 going directly to my breaker box with a double breaker. the plug seem to be wired corectly. and the belt is pretty loose, but doesnt slip.
 
peter r said:
how do i check the 110 thing. i did the wiring myself. i have a 220 going directly to my breaker box with a double breaker. the plug seem to be wired corectly. and the belt is pretty loose, but doesnt slip.
Click to expand...

Using a volt meter, measure between the two hot legs. It should be about 220. If it is more like 110, that means one of the legs that are supposed to be hot are neutral or ground (otherwise no current would flow). That can be a very dangerous situation because something that is not supposed to be carrying current may be. And, if the other hot leg isn't where you think it is - then where is it?

Please don't take my next comment as an insult, I don't mean it that way. If you have to ask how to check the 110 thing - you probably shouldn't be doing the wiring yourself.
 
no offense taken. i had a bit of help for the wiring. ill check the 2 hot legs and see if thats it. also, what could be the issue with the belt? is tighter better?
 
on your drive V belt , push down on it with your thumb , it should only flex about 1/2" . Double check your electrical , at the plug and the motor .
 
well my voltmeter is at my dads house so no help there. my belt is way too loose. i think thats the problem. i doubt my motor is running 110. but ill still check that avenue when i get my meter back.

what ill effects can a loose belt have? and with a 2 hp motor, how hard should i have to press the workpiece into the platen for the grinding belt to slow down?
 
if the belt is constantly slipping you will burn it up and wear out the pulleys . You should be able to use a fair amount of pressure on the sanding belt when all is right .
 
Peter,
Does the motor stall or the belt stall? They are two entirely different problems.
 
i had a 25 inch belt on it and replaced it with a 24inch its great now. very tight. and i can push pretty hard. thanks guys.
 
Yup the old loose belt thing. Had that happen on my new build (boy did I feel stupid) and even upgraded to a 5hp motor. Glad you figured it out.
 
I started installing the motors that power my grinders; using a hinge system.This set up gives you full tension on the belt as well as making it easy to switch from one size pulley to the other. Its easy to accomplish; just get a package of two steel hinges and weld them to a plate that the motor bolts too. No more pinched fingers when you change from one pulley to the next one.
A two hp motor should give you plenty of non stall power on your grinder if set up properly.

Fred
 
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